© 2015 American Chemical Society. Hyperdiffusive relaxations in soft glassy materials are typically associated with out-of-equilibrium states, and nonequilibrium physics and aging are often invoked in explaining their origins. Here, we report on hyperdiffusive motion in model soft materials comprised of single-component polymer-tethered nanoparticles, which exhibit a readily accessible Newtonian flow regime. In these materials, polymer-mediated interactions lead to strong nanoparticle correlations, hyperdiffusive relaxations, and unusual variations of properties with temperature. We propose that hyperdiffusive relaxations in such materials can arise naturally from nonequilibrium or non-Brownian volume fluctuations forced by equilibrium thermal rearrangements of the particle pair orientations corresponding to equilibrated shear modes.
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-C1018-02
Acknowledgements: This work was supported by the National Science Foundation Award No. DMR-1006323 and by Award No. KUS-C1018-02, made by King Abdullah University of Science and Technology (KAUST). Use of the Advanced Photon Source, operated by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.